Methods and systems for an electric drive assembly are provided herein. In one example, an electric drive system is provided that includes two multi-motor drive units with associated planetary gear reductions that have asymmetric gear ratios. The planetary gear reduction in each drive unit includes a ring gear and a sun gear that are rotationally coupled to a pair of motors and a carrier rotationally coupled to an output gear that interfaces with a gear reduction of an axle assembly.

Methods and systems for an electric drive assembly are provided herein. In one example, an electric drive system is provided that includes two multi-motor drive units with associated planetary gear reductions that have asymmetric gear ratios. The planetary gear reduction in each drive unit includes a ring gear and a sun gear that are rotationally coupled to a pair of motors and a carrier rotationally coupled to an output gear that interfaces with a gear reduction of an axle assembly.

An electric powertrain for a vehicle includes a cycloidal speed reducer having an input member configured to couple with a traction motor, a cycloidal disc defining a plurality of circumferentially arranged holes, and a plurality of circumferentially arranged pins each disposed in one of the holes. A differential of the vehicle has a case connected to each of the pins. The differential may be a cycloidal differential.

An electric powertrain for a vehicle includes a cycloidal speed reducer having an input member configured to couple with a traction motor, a cycloidal disc defining a plurality of circumferentially arranged holes, and a plurality of circumferentially arranged pins each disposed in one of the holes. A differential of the vehicle has a case connected to each of the pins. The differential may be a cycloidal differential.

A multi-buffer energy accumulation apparatus comprises: an energy storage cylinder, an oil tank, a first scroll spring mechanism, a second scroll spring mechanism, a hydraulic motor, differential planetary train of gearings, and a generator; wherein the energy storage cylinder comprises a hermetically sealed cylinder body, one end of the hermetically sealed cylinder body being provided with an elastic mobile device, the other end thereof being provided with an energy transmission device, and hydraulic oil is filled in the hermetically sealed cylinder body between the elastic mobile device and the energy transmission device; the hermetically sealed cylinder body, the hydraulic motor, and the oil tank are connected via an oil circuit to form a hydraulic loop; the energy transmission device is connected with the first scroll mechanism; the hydraulic motor is connected with the second scroll spring mechanism.

An electric powertrain for a vehicle includes a cycloidal speed reducer having an input member configured to couple with a traction motor, a cycloidal disc defining a plurality of circumferentially arranged holes, and a plurality of circumferentially arranged pins each disposed in one of the holes. A differential of the vehicle has a case connected to each of the pins. The differential may be a cycloidal differential.

An electric powertrain for a vehicle includes a cycloidal speed reducer having an input member configured to couple with a traction motor, a cycloidal disc defining a plurality of circumferentially arranged holes, and a plurality of circumferentially arranged pins each disposed in one of the holes. A differential of the vehicle has a case connected to each of the pins. The differential may be a cycloidal differential.

A powertrain arrangement for a transverse mounted motor for an electric powered automotive passenger vehicle including opposing wheel shafts for powering two parallel mounted wheels, the shafts rotating about a first axis, the shafts having at least one end torsionally connected with a differential, an electrical rotor torsionally connected with the wheel shafts via a planetary gear train, an electrical stator surrounding the rotor, a casing supporting the rotor and the wheel shafts, the casing encompassing the stator, the casing having a floor forming a lubricant reservoir, and a baffle located in the lubricant reservoir, the baffle having barriers generally transverse to the first axis and at least one of the barriers having a lower window allowing fluid communication underneath the barrier.

A powertrain arrangement for a transverse mounted motor for an electric powered automotive passenger vehicle including opposing wheel shafts for powering two parallel mounted wheels, the shafts rotating about a first axis, the shafts having at least one end torsionally connected with a differential, an electrical rotor torsionally connected with the wheel shafts via a planetary gear train, an electrical stator surrounding the rotor, a casing supporting the rotor and the wheel shafts, the casing encompassing the stator, the casing having a floor forming a lubricant reservoir, and a baffle located in the lubricant reservoir, the baffle having barriers generally transverse to the first axis and at least one of the barriers having a lower window allowing fluid communication underneath the barrier.

A four-wheel driving apparatus for a vehicle may include a planetary gear set including a sun gear, a carrier, and a ring gear, and provided so that the sun gear is coupled to a transmission output shaft; a counter shaft provided in parallel to the transmission output shaft; a sleeve included in the counter shaft, receiving operating force of a shift fork to slide along a longitudinal direction of the counter shaft, and provided to be selectively coupled to any one of the sun gear and the carrier of the planetary gear set according to a sliding position; a center differential connected to a front differential through a front output shaft and connected to a rear differential through a rear output shaft; and a transfer gear device disposed to connect between the counter shaft and any one of the front output shaft and the rear output shaft.